RE: modifications to an 049

RE: modifications to an 049
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All Forums >> RC Airplanes >> "1/2 A" & "1/8 A" airplanes >> RE: modifications to an 049

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RE: modifications to an 049 - 8/25/2007 3:20:45 PM

500 lb. koolaid man

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From: Palm Harbor, FL, USA
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I'll try the heat gun later today on high, I would have never thought of using heat for this. The heat gun should be strong enough, It broke free a piston liner out of an old(vintage) Fuji .35(my neighbor gave me this control line engine) a while ago. By the way, some of you guys really crack me up.

Thanks for all the help guys, it's all very appreciated.

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RE: modifications to an 049 - 8/26/2007 8:23:31 AM

Luna_Rendezvous

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After you heat the cylinder try squirting a few drops of fuel on the head only, this will slightly shrink the head while the cylinder will still be expanded from the heat.

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RE: modifications to an 049 - 8/26/2007 4:08:22 PM

500 lb. koolaid man

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From: Palm Harbor, FL, USA
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Heat gun+pliers&Cox wrench=nothing.

What the heck. I even tried nitro on the head after that, reheating it first. Maybe I'll try a torch later, but I don't have much experience with them(It'll still be safe, just a challenge). And I had a hard time holding it do to the heat, even with oven mittens on. It' so darn small and hot. However, with the cox wrench and pliers on the head, I got good grip, it's just, well...

That gorilla hired by Cox engines must have been HUGE!

I scraped up the head even more

for nothing. Any other suggestions? Or am I SOL.

Thanks.

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RE: modifications to an 049 - 8/26/2007 4:30:24 PM

gcb

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Perhaps I missed something, but do you NEED to get the head off? If not, just run it as-is until you NEED to remove it.

I read where you refer to "wrench". You would do a lot better by borrowing an additional wrench and trying to remove the plug with two wrenches. The thing with the slots on top of the cylinder was so you could exert appropriate pressure without distorting the cylinder.

I'll bet that big a** gorilla would use two wrenches!

You might try to insert some liquid wrench or a penetrating oil around the cylinder/glow plug threads. Remember the seal is at the bottom of the threads.

BTW, we've all probably run across "one of those" fits in our experiences. Good luck.

George

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RE: modifications to an 049 - 8/26/2007 6:14:42 PM

500 lb. koolaid man

Posts: 1052
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From: Palm Harbor, FL, USA
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I have two identical cox wrenches actually, given to me by my neighbor. I tried both at once, even with the two parts heated, and still couldn't get the plug off. I'm starting to think that the gorilla grew even more before he got to putting the glow head on my engine, maybe others are a "little bit" looser than mine. And I guess I'll stop fooling with it for now, I just wanted to loosen the plug because that would save me time in the future, but I (almost)give up. By the time I finish there till be no cooling fins left on the plug.

BTW, I doubt the gorilla used 2 cox wrenches, He probably used a couple of lock pliers, or at least he did for my engine. What a prankster.

Well, thanks for the help George. I'll soak the threads in liquid wrench for a few hours and see if that helps.

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RE: modifications to an 049 - 8/26/2007 7:16:29 PM

burtcs

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500 lb'er:

Since COX engines disassemble themselve in the air, it may that head glow head will loosen by it's self. I suspect your problem is the heat gun and the fact that you don't have a vice to hold the motor in while your heating the cylinder. The point to this is rapid heating of the cylinder expands it a the head come loose. The heat gun heats up the cylinder and head. This causes equal expansion and the head doesn't move.

They may also have used a thread locker (think locktite here) on the threads. all the more reason to use a torch to heat the cylinder. Any way good luck (your having fun of course...)

If you do have a vise, use that as a holding fixture. Take the backplate off the engine and the prop screw. Place the back of the crankcase against one jaw, the drive washer against the other. The you can concentrate on the head (an eventually) the cylinder). Your just trying to hang-on to this thing, not squash it.

regards - Steve B.

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RE: modifications to an 049 - 8/26/2007 9:02:13 PM

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A heat gun is to loosen castor oil related jams, not this. You need a propane torch.

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RE: modifications to an 049 - 8/27/2007 2:44:20 AM

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Torch like I said above just don't over heat the aluminum or you will have a really messed up head. Worked fine for me and Ill admit it took so much pressure that the cox wrench actually hurt my hand. George mine was so tight. even using 2 cox wrenches distorted the head real bad. I had to do like CP said Pliers but I went the extra mile and used a torch and it was still a super human gorilla that reefed it on

< Message edited by unclecrash -- 8/27/2007 2:48:49 AM >

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RE: modifications to an 049 - 8/27/2007 5:11:00 PM

gcb

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quote:

ORIGINAL: 500 lb. koolaid man
...I just wanted to loosen the plug because that would save me time in the future, but I (almost)give up. By the time I finish there till be no cooling fins left on the plug.

Ever heard the advice. "If it ain't broke, don't fix it"? It sure seems to fit here.

As pointed out above, it may loosen up a bit with running (heat cycles). You may get two years running out of that plug.

I know, I know, it's the challenge. I'd probably mess with it too!

George

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RE: modifications to an 049 - 8/28/2007 1:42:54 AM

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Hmmm, if you really ARE the 500 pound Koolaid Man, why do you need our help, anyway?
Maybe Cox found out that we were just buying the $7 engine so we could get at the $9 glowhead?

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RE: modifications to an 049 - 8/29/2007 8:47:02 PM

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i use heads from rjl my sure starts run great no power loss compared to the stock head i have yett to see any real data on the galgreath head and nelson plug i like to get one just to try will see

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RE: modifications to an 049 - 9/3/2007 3:52:35 AM

500 lb. koolaid man

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I plan on running the engine tomorrow morning since I managed to squeeze in enough time today to make a testing mount for it.

I have two questions:

I have always killed my babe bee by throwing a rag at the prop. I have no problem with this, but is there a more recommended way of killing it?

Is there a break in procedure that I should follow? Like run a 1/2 oz. of fuel through it first before I start tuning?

Thanks for the help.

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RE: modifications to an 049 - 9/3/2007 4:08:53 AM

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From: Crete, NE, USA
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For a Babe Bee the rag is the best way since there is not much else you can do short of closing off the fuel by closing the needle valve.

Even so the rag should be just fine as it is quick and simple and does not require resetting the needle valve.

The sure Start on the other hand has a fuel line you can pinch.

Robert

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RE: modifications to an 049 - 9/3/2007 4:21:27 AM

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That's a long way for the fuel to draw... How about drilling a hole to give the line a short cut?

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RE: modifications to an 049 - 9/3/2007 5:07:40 AM

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500LB your stand is a bit over kill! here is what I use just a small board with another with 2 screws holding it for the tank to sit on. Rubber band the tank and clamp it in a vise or c clamp it to a bench. Like skaliwag said it is a bit of a distance for the fuel to flow. Turn the tank around and drill a hole trough the board to shorten it up.

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RE: modifications to an 049 - 9/3/2007 5:18:17 AM

500 lb. koolaid man

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From: Palm Harbor, FL, USA
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I'll turn the tank around and drill a hole trough the board, then shorten the line before I run it tomorrow. Thanks for the tip guys.

"Rubber band the tank and clamp it in a vise or c clamp it to a bench." My mount requires no vice, and all I did other than yours is screwed another board to it creating a "T shape" to allow for the stand to not fall over.

I still need a little info on break in

Thanks for the help and keep it coming.

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